use relative links instead of absolute to allow subpath installation

server.js

@@ -66,19 +66,23 @@ router.get("/", function (req, res) {
 })
 
 router.get("/demo", function (req, res) {
+  url = req.header("host") + req.baseUrl
   res.render("index.jade", {
     pageTitle: "Post-it - demo",
 	headerBarUrl: headerBarUrl,
     logoUrl: logoUrl,
+    url: url,
     demo: true
   })
 })
 
 router.get("/:id", function (req, res) {
+  url = req.header("host") + req.baseUrl
   res.render("index.jade", {
     pageTitle: "Post-it - " + req.params.id,
 	headerBarUrl: headerBarUrl,
-    logoUrl: logoUrl
+    logoUrl: logoUrl,
+    url: url
   })
 })